Crystal structure of TraC

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.263 
  • R-Value Observed: 0.263 

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This is version 1.4 of the entry. See complete history


Structural and functional characterization of the VirB5 protein from the type IV secretion system encoded by the conjugative plasmid pKM101

Yeo, H.-J.Yuan, Q.Beck, M.R.Baron, C.Waksman, G.

(2003) Proc Natl Acad Sci U S A 100: 15947-15952

  • DOI: https://doi.org/10.1073/pnas.2535211100
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Type IV secretion systems mediate intercellular transfer of macro-molecules via a mechanism ancestrally related to that of bacterial conjugation machineries. TraC of the IncN plasmid pKM101 belongs to the VirB5 family of proteins, an essential component of most type IV secretion systems. Here, we present the structure of TraC. VirB5/TraC is a single domain protein, which consists of a three helix bundle and a loose globular appendage. Structure-based site-directed mutagenesis followed by functional studies indicates that VirB5 proteins participate in protein-protein interactions important for pilus assembly and function.

  • Organizational Affiliation

    Institute of Structural Molecular Biology, Birkbeck College, Malet Street, London WC1E 7HX, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TraC213Escherichia coliMutation(s): 0 
Gene Names: trac
Find proteins for Q9L6G5 (Escherichia coli)
Explore Q9L6G5 
Go to UniProtKB:  Q9L6G5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9L6G5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.263 
  • R-Value Observed: 0.263 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 144.015α = 90
b = 144.015β = 90
c = 91.88γ = 120
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-01-06
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2011-09-28
    Changes: Structure summary
  • Version 1.4: 2024-02-14
    Changes: Data collection, Database references